From patchwork Fri Apr 12 09:08:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunfei Dong X-Patchwork-Id: 788517 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 449BB55C3A; Fri, 12 Apr 2024 09:09:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=60.244.123.138 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712912955; cv=none; b=eumzztnLCyZjTtG0Oe8g9nCBgXVoBDiAJMnBEKkpONvQTb5dL635YNlYrAYdHB9UQm0EYzNSpMuzK8i5I1zyuif4eFn8xqJWyClEAScjzviPjMLj74NqmjCL1AookqmiPqc8gFud+WDSoolTboSByulEdkcr2RMnPIU+9Kg4Aqg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712912955; c=relaxed/simple; bh=OFBrZ5G6KahLW+2WGIB0G4F3uNyjoIQj7ICnIoaBi1I=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=a20/0VVVu1dJTo8yr8slKw7HhPvz8+WxOErtc5tTLOwFZKdNo6Rhef20ztCZjXxCl4B1N9KzTbezlc3q7BEjq0lzxtOXO1fxXn4at5+/OV9Yl8bthGBWR28wtvViBoAq4ocuPTgPl+AOOuD6cyE+zqo6tkbD30PishwZItREPvs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=KaoajVVG; arc=none smtp.client-ip=60.244.123.138 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="KaoajVVG" X-UUID: 50eeb7aaf8ac11eeb8927bc1f75efef4-20240412 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=JWJt5f3OFXku7W6faTUM0+bKsbswJle1HktQEF2gUcM=; b=KaoajVVGDbmXWWe9gum+aCYZpYCCZC75xV8I9bd2/azRHh7I0YmyZlOIpMynMKaN2Kf8lbOlEVhx+8+61b8iAV9ITz6PWZOaWQc6zuBIfF4UcXK0aPiYt9nmSACS1C2wioG8KDVZra65H4MQj0a0Pbiy2haxl/65tM0HNRQsurU=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.37, REQID:6065aa95-3f9e-4d8e-b239-cee652d4a629, IP:0, U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-25 X-CID-META: VersionHash:6f543d0, CLOUDID:40f09882-4f93-4875-95e7-8c66ea833d57, B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1, SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-UUID: 50eeb7aaf8ac11eeb8927bc1f75efef4-20240412 Received: from mtkmbs10n1.mediatek.inc [(172.21.101.34)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1734246197; Fri, 12 Apr 2024 17:09:07 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Fri, 12 Apr 2024 17:09:05 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Fri, 12 Apr 2024 17:09:03 +0800 From: Yunfei Dong To: Jeffrey Kardatzke , =?utf-8?q?N=C3=ADcolas_F_=2E_?= =?utf-8?q?R_=2E_A_=2E_Prado?= , Nathan Hebert , "Nicolas Dufresne" , Hans Verkuil , AngeloGioacchino Del Regno , Benjamin Gaignard , Sebastian Fricke , Tomasz Figa , "Mauro Carvalho Chehab" , Marek Szyprowski CC: Chen-Yu Tsai , Yong Wu , "Hsin-Yi Wang" , Fritz Koenig , "Daniel Vetter" , Steve Cho , Yunfei Dong , Sumit Semwal , "Brian Starkey" , John Stultz , "T . J . Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Matthias Brugger , , , , , , Subject: [PATCH v5,07/23] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps Date: Fri, 12 Apr 2024 17:08:35 +0800 Message-ID: <20240412090851.24999-8-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240412090851.24999-1-yunfei.dong@mediatek.com> References: <20240412090851.24999-1-yunfei.dong@mediatek.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--7.817000-8.000000 X-TMASE-MatchedRID: 173cC0PKvpvtt0HEL3BUV4lD2T5imTkJ2qBSQHAh8pg0QmmUihPzrFJS 0b8z/9TB8AyWk2NFMNbijpjet3oGSJCoy9iDotiwNNHZMWDTEbe4UO5+xwKkcStjI02a+7m1J7o vlkPXpS3VaZR68ynk9lCRaYaDm6fHBCaQyxlaPkG3D7EeeyZCMzGZtPrBBPZrEvoxTu3fj1tEe5 BdjBKTALjfysYMcGyRGce8edCRlYkmcsJib2IjaaOuVibdZNTv7yWPaQc4INQOkJQR4QWbsG+3c txX3zZNo2jEjZ+uot1HVle6mAl0da+/EguYor8cFEUknJ/kEl7dB/CxWTRRu4as+d5/8j56CqkU I6VLHbp1IjXaXB8Mtq8az9DCJcKSIUrN7T23diALxcqOxVsmNQ== X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--7.817000-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: 0EEDE86140105F5272934230A2167CFFAC9A4E611673CD905FD21BBA98F89AF92000:8 X-MTK: N From: John Stultz This allows drivers who don't want to create their own DMA-BUF exporter to be able to allocate DMA-BUFs directly from existing DMA-BUF Heaps. There is some concern that the premise of DMA-BUF heaps is that userland knows better about what type of heap memory is needed for a pipeline, so it would likely be best for drivers to import and fill DMA-BUFs allocated by userland instead of allocating one themselves, but this is still up for debate. Signed-off-by: John Stultz Signed-off-by: T.J. Mercier Signed-off-by: Yong Wu [Yong: Fix the checkpatch alignment warning] Signed-off-by: Yunfei Dong --- drivers/dma-buf/dma-heap.c | 83 ++++++++++++++++++++++++++++++-------- include/linux/dma-heap.h | 6 +++ 2 files changed, 73 insertions(+), 16 deletions(-) diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index 97025ee8500f..6efe833a4b10 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -51,12 +51,24 @@ static dev_t dma_heap_devt; static struct class *dma_heap_class; static DEFINE_XARRAY_ALLOC(dma_heap_minors); -static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, - unsigned int fd_flags, - unsigned int heap_flags) +/** + * dma_heap_buffer_alloc - Allocate dma-buf from a dma_heap + * @heap: DMA-Heap to allocate from + * @len: size to allocate in bytes + * @fd_flags: flags to set on returned dma-buf fd + * @heap_flags: flags to pass to the dma heap + * + * This is for internal dma-buf allocations only. Free returned buffers with dma_buf_put(). + */ +struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, + unsigned int fd_flags, + unsigned int heap_flags) { - struct dma_buf *dmabuf; - int fd; + if (fd_flags & ~DMA_HEAP_VALID_FD_FLAGS) + return ERR_PTR(-EINVAL); + + if (heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS) + return ERR_PTR(-EINVAL); /* * Allocations from all heaps have to begin @@ -64,9 +76,20 @@ static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, */ len = PAGE_ALIGN(len); if (!len) - return -EINVAL; + return ERR_PTR(-EINVAL); + + return heap->ops->allocate(heap, len, fd_flags, heap_flags); +} +EXPORT_SYMBOL_GPL(dma_heap_buffer_alloc); - dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags); +static int dma_heap_bufferfd_alloc(struct dma_heap *heap, size_t len, + unsigned int fd_flags, + unsigned int heap_flags) +{ + struct dma_buf *dmabuf; + int fd; + + dmabuf = dma_heap_buffer_alloc(heap, len, fd_flags, heap_flags); if (IS_ERR(dmabuf)) return PTR_ERR(dmabuf); @@ -104,15 +127,9 @@ static long dma_heap_ioctl_allocate(struct file *file, void *data) if (heap_allocation->fd) return -EINVAL; - if (heap_allocation->fd_flags & ~DMA_HEAP_VALID_FD_FLAGS) - return -EINVAL; - - if (heap_allocation->heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS) - return -EINVAL; - - fd = dma_heap_buffer_alloc(heap, heap_allocation->len, - heap_allocation->fd_flags, - heap_allocation->heap_flags); + fd = dma_heap_bufferfd_alloc(heap, heap_allocation->len, + heap_allocation->fd_flags, + heap_allocation->heap_flags); if (fd < 0) return fd; @@ -205,6 +222,7 @@ void *dma_heap_get_drvdata(struct dma_heap *heap) { return heap->priv; } +EXPORT_SYMBOL_GPL(dma_heap_get_drvdata); /** * dma_heap_get_name - get heap name @@ -217,6 +235,7 @@ const char *dma_heap_get_name(struct dma_heap *heap) { return heap->name; } +EXPORT_SYMBOL_GPL(dma_heap_get_name); /** * dma_heap_add - adds a heap to dmabuf heaps @@ -307,6 +326,37 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) kfree(heap); return err_ret; } +EXPORT_SYMBOL_GPL(dma_heap_add); + +/** + * dma_heap_find - get the heap registered with the specified name + * @name: Name of the DMA-Heap to find + * + * Returns: + * The DMA-Heap with the provided name. + * + * NOTE: DMA-Heaps returned from this function MUST be released using + * dma_heap_put() when the user is done to enable the heap to be unloaded. + */ +struct dma_heap *dma_heap_find(const char *name) +{ + struct dma_heap *h; + + mutex_lock(&heap_list_lock); + list_for_each_entry(h, &heap_list, list) { + if (!kref_get_unless_zero(&h->refcount)) + continue; + + if (!strcmp(h->name, name)) { + mutex_unlock(&heap_list_lock); + return h; + } + dma_heap_put(h); + } + mutex_unlock(&heap_list_lock); + return NULL; +} +EXPORT_SYMBOL_GPL(dma_heap_find); static void dma_heap_release(struct kref *ref) { @@ -332,6 +382,7 @@ void dma_heap_put(struct dma_heap *heap) { kref_put(&heap->refcount, dma_heap_release); } +EXPORT_SYMBOL_GPL(dma_heap_put); static char *dma_heap_devnode(const struct device *dev, umode_t *mode) { diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h index d57593f8a1bc..3cbf9bff2346 100644 --- a/include/linux/dma-heap.h +++ b/include/linux/dma-heap.h @@ -46,6 +46,12 @@ const char *dma_heap_get_name(struct dma_heap *heap); struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info); +struct dma_heap *dma_heap_find(const char *name); + void dma_heap_put(struct dma_heap *heap); +struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, + unsigned int fd_flags, + unsigned int heap_flags); + #endif /* _DMA_HEAPS_H */